The present invention relates to a cosmetic container having an inner container and a sealing structure for an inner container cap and, more specifically, to a cosmetic container having an inner container and a sealing structure for an inner container cap in which an outer wall of the inner container is formed to have a larger diameter than a sealing projecting ring formed on the lower portion of the inner container cap such that the sealing projecting ring is forcibly inserted into the outer wall of the inner container, and a first hinge block having an oval hinge hole formed therein is formed on a side of the inner container such that a hinge pin is able to move up and down in the hinge hole, thereby enhancing a force for sealing the interior of the inner container when the inner container is closed.